Quick answer
Dex-Cool coolant is GM's long-life orange coolant. Chevrolet manuals specify DEX-COOL meeting GM Standard GMW3420, mixed 50/50 with clean, drinkable water, and GMW 3420 superseded GM 6277M. 13 products in our data list one of the two codes.
What to buy
PEAK DEX-COOL Concentrate Antifreeze + Coolant · Concentrate · lists GMW 3420
One of the products whose maker lists this spec code, with a verified Amazon listing. Buy only if your owner's manual names the same code.
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Key takeaways
- Current code: GMW 3420.
- GM 6277M is the older, superseded code.
- Genuine product: ACDelco Dex-Cool.
- Mix 50/50 with clean water, per the manual.
What the code means
- Chevrolet owner manuals specify a 50/50 mix of clean, drinkable water and DEX-COOL coolant meeting GM Standard GMW3420 (read in a copy of the 2024 Trax manual). [2]
- GM Parts lists ACDelco GM Original Equipment Dex-Cool 50/50 (12378390) as orange, silicate-, borate-, nitrite- and phosphate-free and "based on carboxylate technology". [3]
- Motorcraft describes GMW 3420 as having "superseded GM 6277M". [4]
Genuine Dex-Cool
GM / Chevrolet genuine coolant: ACDelco GM Original Equipment Dex-Cool 50/50 Pre-Mix Engine Coolant
Check price on Amazon All buying optionsUse it if your owner's manual calls for it. Some models and years use a different coolant; the era table below shows what we could source.
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Older GM vehicles that left the factory with green coolant used other codes (GM 1825M / 1899M appear in coolant makers' literature). See best coolant for Chevy & GM.
About to top up with a different coolant?
Check compatibility →Coolants whose maker lists it (13)
Each row is a product whose manufacturer lists this code on its own page or datasheet (data checked 22 Oct 2026). A listed code is the maker's claim; we have not tested the products. Products with a checked Amazon listing come first.
As an Amazon Associate I earn from qualifying purchases. Commissions never change which products we list or what the data says.
Related spec codes
Ford WSS-M97B44-D · Mopar MS-12106, MS-90032 & MS-9769 · JIS K2234 (Japanese standard) · all coolant specs. Buying for a particular car? See Toyota, Honda, Nissan, Subaru, Ford.
Frequently asked questions
Is GM 6277M still current?
Motorcraft describes GMW 3420 as having superseded GM 6277M. Many products list both.
Is Dex-Cool compatible coolant the same as Dex-Cool?
A product that lists GMW 3420 claims to meet the same standard. Genuine Dex-Cool is sold by ACDelco.
New to cooling systems? Start with how a car cooling system works. Looking for a product? Search the coolant directory or match your manual's spec with Find my car coolant. See also coolant by car make and coolants by brand.
Ready to buy?
PEAK DEX-COOL Concentrate Antifreeze + Coolant · Concentrate · lists GMW 3420. Check that your owner's manual calls for it.
Check price on AmazonAll buying optionsAs an Amazon Associate I earn from qualifying purchases. Commissions never change which products we list or what the data says.